EPRI shows that direct current superconductor cable is feasible for development using today’s technology

The Electric Power Research Institute (EPRI) has published a report that describes the design of a superconducting direct current (DC) cable system capable of moving thousands of megawatts of electricity between regions, and which is  practical and ready for commercial development, using today's technology. 

The EPRI analysis points to significant efficiency gains using superconducting DC transmission lines, with the capability to reduce transmission losses at full load by 50 percent or more compared to alternating current (AC) or high-voltage DC systems.  Assuming the trend continues for cost-performance improvements in superconducting wire, such a line could become an option within a decade along with Extra High Voltage (EHV) AC lines that are currently used to move large amounts of power over long distances.

Read more on the EPRI website.